Earth Syst. Dynam. Discuss., doi:10.5194/esd-2017-21, 2017 Manuscript under review for journal Earth Syst. Dynam. Discussion started: 9 March 2017 c Author(s) 2017. CC-BY 3.0 License. A Lagrangian Perspective of the Hydrological Cycle in the Congo River Basin Rogert Sorí1, Raquel Nieto1,2, Sergio M. Vicente-Serrano3, Anita Drumond1, Luis Gimeno1 1 Environmental Physics Laboratory (EphysLab), Universidade de Vigo, Ourense, 32004, Spain 5 2 Department of Atmospheric Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of SãoPaulo, São Paulo, 05508-090, Brazil 3 Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (IPE-CSIC), Zaragoza, 50059, Spain Correspondence to: Rogert Sorí (
[email protected]) Abstract. 10 The Lagrangian model FLEXPART was used to identify the moisture sources of the Congo River Basin (CRB) and investigate their role in the hydrological cycle. This model allows us to track atmospheric parcels while calculating changes in the specific humidity through the budget of evaporation-minus-precipitation. The method permitted the identification at an annual scale of five continental and four oceanic regions that provide moisture to the CRB from both hemispheres over the course of the year. The most important is the CRB itself, providing more than 50% of the total atmospheric moisture income to the basin. Apart 15 from this, both the land extension to the east of the CRB together with the ocean located in the eastern equatorial South Atlantic Ocean are also very important sources, while the Red Sea source is merely important in the budget of (E-P) over the CRB, despite its high evaporation rate.